> We use common language to refer to common things in understandable ways in order to communicate with each other.

Common doesn't mean ever-present. In practice, it is impossible for everyone to converge on a shared understanding for all terms. There are provably many people in the world who have never even heard the term "abject poverty" before. They cannot possibly understand what the term means to you. Fundamentally, "abject poverty" can only mean in that comment what the author believes it means. That may overlap with your understanding, but it also may not. We can also prove that he is not a mind reader and thus cannot tune it to your understanding. He is limited to his understanding and his understanding alone.

A good faith actor who believes there may be a discrepancy in understanding will seek clarification. That is what a discussion forum is all about. If one does not want to participate in discussion, why be here?